Hi there, this is an NP1 battery cup with six AC adapters. My guess is that these went to a lectronics receiver and one of the adapters is for a mixer. Again, my guess would be this would be for a sound devices unit. This item is over 20 years old. I used it twice. Someone left it in a bag they sold me. it looks like it was fabricated by Jeff Wexler, so it is a quality item.